// Copyright 2023 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
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//    this software without specific prior written permission.
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#include "dawn/platform/metrics/HistogramMacros.h"

namespace dawn::platform::metrics {

DawnHistogramTimer::DawnHistogramTimer(Platform* platform)
    : mPlatform(platform),
      mConstructed(mPlatform != nullptr ? mPlatform->MonotonicallyIncreasingTime() : 0) {}

void DawnHistogramTimer::RecordMicroseconds(const char* name) {
    if (mPlatform == nullptr || name == nullptr || mConstructed == 0) {
        return;
    }
    // TODO(dawn:1934) Unify the constants when/if possible.
    int elapsedUS =
        static_cast<int>((mPlatform->MonotonicallyIncreasingTime() - mConstructed) * 1'000'000.0);
    mPlatform->HistogramCustomCountsHPC(name, elapsedUS, 1, 1'000'000, 50);
}

void DawnHistogramTimer::Reset() {
    if (mPlatform == nullptr) {
        return;
    }
    mConstructed = mPlatform->MonotonicallyIncreasingTime();
}

}  // namespace dawn::platform::metrics
